No more Multi Window

I recently flashed the "all apps in multi window" mod from legendk95 on my rooted, unlocked, stock 4.1.1 Verizon Note 2. Now I have NO MULTI WINDOW AT ALL. Although the option is checked in settings/display, I now get NOTHING when holding down the back button. Any ideas on how to get it back (with all the apps preferably)? Thanks.

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